JP2001259741A - Circularity correcting apparatus of steel tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circularity correcting apparatus capable of easily correcting an end part of a steel tube even when a deformed steel side is of relatively a large size and is fixed. SOLUTION: The apparatus is provided with a fixed circularity correcting body 1 mounted near the end part of a deformed piping 6a, a moving circularity correcting body 2 to hold a piping 6a end part by pressing an inner peripheral part of the piping 6a end part between the fixed circularity correcting body 1 and itself, a guide body 3 which is mounted to the fixed circularity correction body 1 and guides movement of the moving circularity correcting body 2, a hydraulic ram 5 which is mounted to the fixed circularity correcting body 1 and transmits pressing force moving circularity correcting body 2. By this method, the fixed circularity correcting body 1 is mounted near the piping 6a end part, and the inner peripheral face of the piping 6a end part is pressed with the moving circularity correcting body 2, thus, positioning is not required by moving the piping 6a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for correcting the roundness of an end of a deformed steel pipe.

[0002]

2. Description of the Related Art Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 3-155416, a straightening section for straightening a part of a deformed steel pipe end by narrowing pressure, and the straightening section are mounted. There has been proposed a steel pipe roundness straightening device provided with a dedicated cart.

[0003]

However, in the above-described conventional steel pipe roundness correcting apparatus, since the positional relationship between the exclusive carriage and the straightening section cannot be changed, the steel pipe to be straightened is turned to deform it. It is necessary to dispose the damaged portion near the straightening portion, and when the steel pipe side is large or fixed, there is a problem that the steel pipe side cannot be turned and the straightening operation cannot be performed. For example, when correcting the deformation of the piping opening of the hydraulic jack serving as the drive source of the hydraulic elevator, the entire hydraulic jack having a large weight of 200 to 300 kg is deformed by tilting or tilting the entire hydraulic jack in the vicinity of the correction unit. However, it is very difficult to handle the hydraulic jack in such a manner, so that there is a disadvantage that the straightening operation cannot be performed.

The present invention has been made in view of such a situation in the prior art, and an object thereof is to easily correct the end of a steel pipe even if the deformed steel pipe is relatively large or fixed. It is an object of the present invention to provide a steel pipe roundness straightening device which can perform the rounding.

[0005]

In order to achieve the above object, the present invention relates to a steel pipe roundness correcting device for correcting the roundness of an end portion of a deformed steel pipe. A fixed roundness correction body having substantially the same inner diameter value, the inner circumference of which is attached near the end of the steel pipe so as to cover the outer circumference of the steel pipe, and pressing the inner circumference of the steel pipe end. A moving roundness corrector that clamps the end of the steel pipe between the fixed roundness corrector and corrects the roundness of the steel pipe, and a movement of the movable roundness corrector attached to the fixed roundness corrector. And a pressurizing body attached to the fixed roundness corrector and transmitting a pressing force to the movable roundness corrector.

In the apparatus for correcting roundness of a steel pipe according to the present invention configured as described above, the fixed roundness corrector is fixed to a position where the movable roundness corrector can press the inner circumference of the deformed steel pipe end. If it is mounted near the end, there is no need to move and position the steel pipe, so that even if the deformed steel pipe is relatively large or fixed, the end of this steel pipe can be easily corrected. .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a steel pipe roundness correcting apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a steel pipe roundness correction device according to one embodiment of the present invention,
FIG. 2 is a side view of the steel pipe roundness correction device of the present embodiment, and FIG.
FIG. 4 is a front view for explaining the operation principle of the steel pipe roundness straightening device of the present embodiment, and FIG. 4 is an enlarged view showing a main part of FIG.

The hydraulic jack 6 shown in FIG. 1 serves as a drive source for a hydraulic elevator, for example, and supplies and discharges hydraulic oil from a pipe 6a.

The steel pipe roundness correcting device of this embodiment is a fixed pipe which is positioned near the end of a steel pipe, for example, the above-mentioned pipe 6a, which is deformed and to be corrected, and which is attached so as to cover the outer peripheral portion thereof. A moving round corrector 2 for narrowing and correcting the end of the pipe 6a between the round corrector 1 and the fixed round corrector 1 by pressing the inner round part of the pipe 6a, and the moving round corrector 2 A guide body 3 that guides the moving circularly by a sliding portion 3a, a pressurizing body that transmits a pressing force to the moving roundness correcting body 2,
For example, it is composed of a hydraulic ram 5 and a base 4 on which the fixed roundness corrector 1, the guide body 3 and the hydraulic ram 5 are installed.

The fixed roundness corrector 1 is disposed in the direction in which the hydraulic ram 5 is pressed (upward in FIG. 1), and has a notch (notch) serving as a clearance when the end of the pipe 6a is corrected. ) A first fixed roundness correction section 1a having a first fixed roundness correction section 1a, and a first fixed roundness connection section connected to the first fixed roundness correction section 1a and having an inner diameter value substantially equal to the regular outer diameter value of the pipe 6a. And a second fixed roundness correcting section 1c which forms an inner peripheral portion with the roundness correcting section 1a. In addition, the notch part 1b which becomes an escape margin is
In consideration of the occurrence of a return due to the residual stress after pressing (correcting) the deformed pipe 6a, a first fixed perfect circle is made to be able to be further pressed from the perfect circular state so as to secure the regular circularity in the returned state. It is provided on the upper part of the correction unit 1a.

The moving roundness correction member 2 includes a roundness correction portion 2a having a part of the outer peripheral curved surface having substantially the same value as the normal inner diameter value of the deformed pipe 6a, and a sliding portion of the guide member 3. 3a and a guide rail 2b to be engaged.

In the steel pipe roundness correcting apparatus of this embodiment, first, the handle 5c of the hydraulic ram 5 is moved up and down so that the pressing force from the hydraulic pump 5b is increased by the plunger 5a.
When the plunger 5a rises, the movable roundness corrector 2 is pressed from below, and the movable roundness corrector 2 rises.

When the movable roundness correction body 2 rises in this way, as shown in FIG. 3, the roundness correction portion 2a also rises and presses the inner peripheral surface 6b of the deformed portion of the pipe 6a. When further pressurized by the hydraulic pump 5b, as shown in FIG. 4, the outer peripheral surface 6c of the deformed portion of the pipe 6a is pressed until the outer peripheral surface 6e coincides with the inner peripheral surface of the fixed roundness corrector 1. . At this time, the inner peripheral surface 6d of the pipe 6a is narrowed by the roundness corrector 2a, and the outer peripheral surface 6e is narrowed by the fixed roundness corrector 1.

In consideration of the occurrence of return due to residual stress, the outer peripheral surface 6c of the deformed portion is formed by the notch 1 in FIG.
Further, the hydraulic pump 5 is moved so as to reach a broken line portion 6f near b.
After pressurizing b, the hydraulic pump 5b is depressurized to remove the fixed roundness corrector 1 from the end of the pipe 6a. As a result, the end of the deformed pipe 6a is corrected and restored to a perfect circular shape before the deformation.

In the apparatus for correcting roundness of a steel pipe according to the present embodiment configured as described above, the pipe 6a in which the movable roundness corrector 2 is deformed is used.
If the fixed roundness corrector 1 is mounted near the end of the pipe 6a so that the inner circumference of the end can be pressed, it is necessary to move the pipe 6a (ie, the pipe 6a and the hydraulic jack 6) for positioning. Since the pipe 6a is relatively large or fixed, the end of the deformed pipe 6a can be easily corrected.

[0016]

As described above, according to the present invention, the fixed roundness corrector is mounted near the end of the steel pipe so that the movable roundness corrector can press the inner periphery of the deformed steel pipe end. In this case, since it is not necessary to move and position the steel pipe, the end of the deformed steel pipe can be easily corrected even if the steel pipe is relatively large or fixed. Therefore, there is an effect that the present invention can be applied to a work for correcting deformation of a steel pipe of a relatively large or fixed object.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a steel pipe roundness correcting device according to an embodiment of the present invention.

FIG. 2 is a side view of the steel pipe roundness correction device of the present embodiment.

FIG. 3 is a front view illustrating the operation principle of the steel pipe roundness correction device of the present embodiment.

FIG. 4 is an enlarged view showing a main part of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed roundness correction body 1a 1st fixed roundness correction part 1b Notch part 1c 2nd fixed roundness correction part 2 Moving roundness correction body 3 Guide body 5 Hydraulic ram (pressure body) 6a Piping (steel pipe)

Claims (2)

[Claims] 1. A steel pipe roundness correcting device for correcting the roundness of an end of a deformed steel pipe, wherein the steel pipe has an inner diameter value substantially equal to a regular outer diameter value of the steel pipe, and an inner peripheral portion thereof has A fixed roundness correction body attached near the end of the steel pipe to cover the outer circumference of the steel pipe, and the steel pipe end between the fixed roundness correction body by pressing the inner circumference of the steel pipe end. A moving roundness corrector that clamps and corrects the roundness of the steel pipe,
A guide body attached to the fixed roundness corrector and guiding the movement of the moving roundness corrector; and a pressurizing body attached to the fixed roundness corrector and transmitting a pressing force to the movable roundness corrector. A steel pipe roundness straightening device comprising: 2. The first fixed roundness, wherein the fixed roundness corrector is arranged in a pressing direction of the pressurizing body and has a cutout portion serving as a clearance when the end of the steel pipe is corrected. The straightening department,
The steel pipe roundness correction device according to claim 1, further comprising a second fixed roundness correction portion connected to the first fixed roundness correction portion and forming the inner peripheral portion.